Electric-arc lamp.



W. LEGEL. ELECTRIC ARC LAMP.

APPLICATION FILED rm. 3, 1910.

Patented Nov. 29, 1910.

gay/Z INYENTUR WILLY E'GEL. M

mx gm. f W; M

H75 ATTUHNEK THENGRRIS PETERS CO., WASHINGTON, D C.

STATES T OFFICE.

winter or BERLIN, GERMANY, ASSIGNOR TO GENERAL nnn'crrnro COMPANY, A CORPORATION on NEW YORK.

ELECTRIC-ARC LAMP.

Specification of Letters Patent.

Patented Nov. 29, 1910.

To all whom it may concern:

Be it known that I, VVILLY LEGEL, a subject of the King of Prussia and the Emperor of Germany, residing at Berlin, Germany, have invented certain new and useful Improvements in Electric-Arc Lamps, of which the following is a specification.

My invention relates to electric arc lamps, and more particularly to that type of lamp in which the electrodes are converging and the arc is controlled by a lateral displacement of one or both electrodes. In this type of lamp it has been found difiicult to seal the necessarily large apertures, through which the movable electrodes must pass, sufficiently well to protect the frame and mechanism of the lamp from the injurious products of combustion arising from the arc.

The object of this invention is to overcome this diiiiculty, and I do this by em-' ploying movable sealingand electrodeguide plates and actuating by one of them the moving electrode and another sealing plate, so as to close the aperture in the econo-v mizer in all positions of the electrode.

One embodiment of my invention is disclosed in the following specification and drawings, in which Figure 1 is an elevation of an economizer supporting the sealing device; Fig. 3 is a sectional view through the plane of the electrodes; and Figs. 2 and 4 are top views corresponding to the minimum and maximum displacement of the electrodes, respectively.

Referring to the drawings, it will be seen that the three superimposed plates, 1, 2 and 3, respectively, are supported by the economizer 1, and that each plate has an aperture smaller than that of the next lower. The plate 1 is fixed and is preferably not integral with the economizer 4, although in this re' spect choice may be exercised; it has an aperture 5 large enough for thetotal displacement of the movable electrode 6, and is secured to or held against the economizer 4. in any convenient manner. The movable plate 2 is pivoted. to the fixed plate 1 at 7 i and to the movable guide plate 8 at 8. The movable plate 8 provided with a project ing tongue 9 for the purpose of connecting the same to the regulating mechanism (not shown) of the lamp. This tongue 9 is not necessary of course in a lamp in which the movable electrode 6 is actuated independently of the movable plate 3. The plate 3 has an aperture just large enough to admit the electrode 6 with a free feeding movement of the same, and is provided with a slot for the upwardly projecting pivot 7 which serves as a stop for the movable plates 2 and 3. These movable plates, however, might be limited in their motion in any other suitable manner.

hen the plate 3 is being actuated, the plate 2 turns about the fixed pivot 7 as a center of rotation, and, since by preference the two pivots 7 and 8 are equally distant from the center of the electrode 6, the plate 2, at the point where the electrode 6 passes through, travels only half the distance as does the plate 8. This permits the use of a plate 2 large enough to cover that portion of the aperture 5 which is not covered by the plate 3 without at the same time being large enough to come in contact with the side of the fixed electrode 10 when the arcing ends of the electrodes come in contact.

The fixed plate 1 is secured to the economizer by screws, as shown, or in any other convenient manner, and is provided with an aperture just large enough to allow the electrode 10 to freely pass through, so as to feed downwardly without impediment.

What I claim as new and desire to secure by Letters Patent of the United States, is:

1. In an electric arc lamp in which the arc is controlled by a lateral displacement of one electrode, the combination of said electrode with means for actuating the same, an economizer provided with an aperture for said electrode, and means for sealing said aperture consisting of a fixed and two movable superimposed guide plates, each movable plate being pivoted to the next lower plate and covering a definite portion of the said aperture.

2. In an electric arc lamp in which the arc is controlled by a lateral displacement of one electrode, the combination of the laterally movable electrode with an economizer provided with a wide aperture for both electrodes, and means for sealing said aperture consisting of a fixed plate secured to said economizer, a sliding guide plate provided with means for connection to the regulating mechanism of the lamp, and a second movable plate placed between and pivoted to the two other plates.

3. In an electric arc lamp in which the arc is controlled by a lateral displacement of one electrode, the combination of the laterally electrode, the combination of an economizcr movable electrode with an economizer provided with an aperture for the passage of both electrodes and the lateral displacement of one of them, and means for sealing said aperture consisting of a series of apertured superimposed plates, each plate being pivoted to and having an aperture smaller than that of the next lower, the lowermost plate being fixed, and the uppermost plate having means for connection to the regulating mechanism of the lamp.

l. In an electric arc lamp in which the electrodes are converging and the arc is 0011- trolled by a lateral displacement of one provided with an aperture permitting the lateral displacement of said electrode, a series of superimposed guide plates for sealing said aperture, each plate being pivoted to the next in the series, the uppermost having means for connection to the regulating mechanism of the lamp, and the lowermost being secured to the economizer.

In witness whereof, I have hereunto set my hand this 18th day of January, 1910.

VILLY LEGEL. Witnesses JULIUS RUMLAND, KARL BREKEBEN. 

